docs: record item 48, tag removal suggests every tag

The remove field's completer is built from knownTags, the whole database's
tag list, because TagDialog builds both fields' completers in one loop. Only
the tags a thread already carries can be removed from it.

The dialog is already given currentTags and uses it to render the existing
tags, so the candidate list is in hand and this needs no new plumbing.

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